The Walter HWK 109-509 powered the first piloted aircraft of any type to exceed how many MPH in level flight?
621
-1
Section::::Abstract.
Walter HWK 109-509
10480103
-1
Section::::Abstract.
Messerschmitt Me 163 Komet
20486
-1
Section::::Abstract.
Messerschmitt Me 163 Komet
20486